Re: PR1ME C compiler sources

"Derek M. Jones" <derek@_NOSPAM_knosof.co.uk>
Thu, 26 Sep 2019 11:53:20 +0100

          From comp.compilers

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Re: PR1ME C compiler sources drb@ihatespam.msu.edu (2019-09-27)
Re: PR1ME C compiler sources derek@_NOSPAM_knosof.co.uk (Derek M. Jones) (2019-09-28)
Re: PR1ME C compiler sources gneuner2@comcast.net (George Neuner) (2019-09-27)
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Re: C compiler pointer management on DSPs derek@_NOSPAM_knosof.co.uk (Derek M. Jones) (2019-09-28)
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From: "Derek M. Jones" <derek@_NOSPAM_knosof.co.uk>
Newsgroups: comp.compilers
Date: Thu, 26 Sep 2019 11:53:20 +0100
Organization: virginmedia.com
References: 19-09-003 19-09-004 19-09-006 19-09-007
Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="91767"; mail-complaints-to="abuse@iecc.com"
Keywords: C, history, comment
Posted-Date: 27 Sep 2019 01:06:51 EDT
In-Reply-To: 19-09-007
Content-Language: en-US

John,


> [The Prime machines suffered from having too many versions of
> everything. Page 41 of that quick reference card has a 48 bit pointer
> format with a bit number in the low 16 bits. It seems unlikely that a
> C compiler would use that as a general pointer format since it doesn't
> fit in any sort of normal int, and it's not what you'd want to point
> at an int or a function or anything bigger than a char. -John]


Some Cray machines and DSP chips have a similar problem with using
word addressing.


Several solve the problem by defining the word to be the smallest
addressable unit, making chars 48-bits in the case of some DSPs.


There seems to be a general dearth of PR1ME C compiler reference
manuals (which wold contain the details).


--
Derek M. Jones
blog:shape-of-code.coding-guidelines.com
[C had issues on any word addressed machine. Some of the hacks people
tried on the PDP-10 were pretty ugly, too. -John]


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